Extra newline is added after empty values

[laurynasr]

Describe the bug
The library adds an additional newline after an empty value and a newline

To Reproduce

import { parseDocument } from 'yaml';
import { createPatch } from 'diff';

const yaml = `
map:
  item:

anothermap:
  anotheritem:

`;

const document = parseDocument(yaml);
const result = document.toString();

const patch = createPatch('output', yaml, result);

console.log(patch);

Output:

Index: output
===================================================================
--- output
+++ output
@@ -1,7 +1,8 @@
-
 map:
   item:

+
 anothermap:
   anotheritem:

+

Expected behaviour
Expected output:

Index: output
===================================================================
--- output
+++ output

Versions (please complete the following information):

• Environment: Node v16.16.0
• yaml: 2.2.2

[eemeli]

Yup, that's a bug. The empty value ends up with a spaceBefore: true, even though that should probably end up on the subsequent anothermap key.

PR welcome, not sure when I might get to this myself.

[rafgugi]

although this is very tricky, can we fix by removing triple newlines? 😁